摘要
以工业级硫酸氧钛为原料,以粉煤灰为载体,采用水解法制备了Fe-TiO2/粉煤灰催化剂,通过XRD、SEM、固体紫外-可见光谱对该催化剂进行了表征。以甲基橙作为研究对象,用该光催化剂对甲基橙水溶液进行了光催化降解,比较了不同催化剂、不同Fe3+掺杂量、煅烧温度、催化剂重复使用次数等因素对甲基橙水溶液降解率的影响。结果表明:煅烧温度对催化剂的晶型有一定影响,500℃煅烧条件下TiO2平均晶粒尺寸为28.25nm,锐钛相占约97.4%(wt,质量分数,下同)。Fe3+使得紫外-可见光谱吸收边红移,能吸收可见光,且掺杂0.3%最好。白炽灯下照射3h,0.3%Fe-TiO2/粉煤灰催化剂使甲基橙水溶液降低率达50.6%,相比于TiO2/粉煤灰显示出更高的光催化降解效果。催化剂经活化处理后,相同条件下重复使用5次仍然有较高的催化活性。
Fe-TiO2-coated fly ash catalyst（Fe-TiO2/FA catalyst）was prepared by hydrolyzation of TiOSO4 and characterized by XRD,SEM and UV-Vis spectra techniques,respectively.The photocatalytic activity of Fe-TiO2/FA catalyst was investigated by measuring the photodegradation of methyl orange aqueous solution during visible light irradiation.Effects of catalyst type,Fe3＋doping amount,calcined temperature and retrieve counts of Fe-TiO2/FA catalysts on degradation ratios were discussed.The results showed that the average particle size of TiO2 was 28.25 nm and anatase phase was about 97.4% when calcination temperature was 500℃.The absorption threshold of Fe-TiO2/FA catalyst shifted to a longer wavelength compared to the photocatalyst without Fe3＋-doping in the UV-vis absorption spectra.Compared with TiO2/FA catalyst and Fe-TiO2/FA catalyst,the degradation ratio using Fe-TiO2/FA catalyst was superior to TiO2/FA catalyst.It was found that about 50.6% methyl orange aqueous solution was degraded after 3husing Fe-TiO2/FA catalyst during visible light irradiation.The best calcined temperature was 500℃and the optimum doping of Fe/Ti molar ratio was 0.3%.The Fe-TiO2/FA catalyst could be recovered by filtration and regain photocatalytic activity by calcination.The degradation ratio was still about 40.1% using the catalyst reused for 5times.
出处
《化工新型材料》
CAS
CSCD
北大核心
2015年第10期188-190,共3页
New Chemical Materials
基金
2014年镇江高等专科学校横向合作项目(GZHX-1410)
江苏省高校科研成果产业化推进拨款项目(JHB2012-48)
江苏省环境功能材料重点实验室(SJHG1306)
关键词
硫酸氧钛
粉煤灰
光降解
甲基橙
TiOSO4
light degradation
fly ash
methyl orange
